move the setuid wrapper binary into its own folder

diff --git a/CMakeLists.txt b/nsupd-wrapper/CMakeLists.txt
similarity index 100%
rename from CMakeLists.txt
rename to nsupd-wrapper/CMakeLists.txt

diff --git a/dyn-nsupdate.cpp b/nsupd-wrapper/dyn-nsupdate.cpp
similarity index 100%
rename from dyn-nsupdate.cpp
rename to nsupd-wrapper/dyn-nsupdate.cpp